Possessing multiple stellar populations has been accepted as a common feature of globular clusters(GCs). Different stellar populations manifest themselves with
The excitation of H2O masers usually needs very high density gas,hence it can serve as a marker of dense gas in HⅡ region. We selected a sample of H2O maser so
The optical spectrum of SDSS J022119.84 + 005628.4 (R. A. = 02h 21m 19.84s, Dec = 00°56′ 28.4", J2000; z - 0.399785 ± 0.000558) is analyzed by multi-
We present a multi-wavelength study of the gravitational lens COSMOS J095930+023427 (z l=0.892),together with the associated galaxy group along the line of sigh